They waved banners with slogans such as "President Trump, denounce white nationalism”, and “We do bridges not walls”, a reference to Mr Trump's hard-line immigration stance.

It came after Jewish leaders, politicians and at least one of the victims' families criticised Mr Trump for his divisive rhetoric in the aftermath of Saturday's shooting, the deadliest attack on Jews in America's history.

Protesters shouted "leave Pittsburgh, leave Pennsylvania" outside the Tree of Life Synagogue, the site of the massacre, where the president and First Lady Melania Trump were paying their respects.

At a makeshift memorial outside the synagogue, the Trumps placed white roses and a stone from the White House for each of the dead.

They were joined by Mr Trump's daughter Ivanka and her husband, Jared Kushner, as well as Tree of Life Rabbi Jeffrey Myers and Ron Dermer, Israel's ambassador to the US.

President Trump watches as first lady Melania Trump places a flower on a memorial to shooting victims as they stand with Tree of Life Synagogue Rabbi Myers in PittsburghCredit:
KEVIN LAMARQUE/Reuters

Mr Trump came face to face with protesters as he arrived at a hospital treating victims of the shooting, driving passed several hundred demonstrators on the street and a sign that said, "It's your fault."

The tragedy has heightened a national debate over Mr Trump's political rhetoric, which his critics say has contributed to a surge in right-wing extremism in the United States.

Many Gang Members and some very bad people are mixed into the Caravan heading to our Southern Border. Please go back, you will not be admitted into the United States unless you go through the legal process. This is an invasion of our Country and our Military is waiting for you!